The SDKB180199AA from Sangshin is a RF & Microwave Circulator with Frequency 1805 to 1990 MHz, Average Power Forward 125 W, Insertion Loss 0.25 to 3 dB, Isolation 21 to 25 dB, Return Loss 21 to 25 dB. Tags: Surface Mount Circulator. More details for SDKB180199AA can be seen below.